216505158 has 16 divisors (see below), whose sum is σ = 433344816. Its totient is φ = 72112640.

The previous prime is 216505153. The next prime is 216505189. The reversal of 216505158 is 851505612.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216505153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5091 + ... + 21422.

It is an arithmetic number, because the mean of its divisors is an integer number (27084051).

Almost surely, 2^216505158 is an apocalyptic number.

216505158 is an abundant number, since it is smaller than the sum of its proper divisors (216839658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216505158 is a wasteful number, since it uses less digits than its factorization.

216505158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27879.

The product of its (nonzero) digits is 12000, while the sum is 33.

The square root of 216505158 is about 14714.1142444933. The cubic root of 216505158 is about 600.4673747291.

The spelling of 216505158 in words is "two hundred sixteen million, five hundred five thousand, one hundred fifty-eight".